这是一个创建于 3675 天前的主题，其中的信息可能已经有所发展或是发生改变。
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lalawue 2014-12-06 17:37:16 +08:00 via Android
转成索引色了吧
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jun4rui 2014-12-06 17:41:56 +08:00 via Android
很多PNG压缩以后直接和jpg比尺寸了
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snail1988 2014-12-06 18:05:47 +08:00  1
我以前用imageOptim压缩，感觉不错
和这个一比弱爆了 |
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emric 2014-12-06 18:08:38 +08:00
确实比同类压缩会高一些.
例如项目中某一张图片: PS 8.55 KB / Yahoo Smushit 5.98 KB / CssGaga 3.14 KB / TinyPNG 2.66 KB |
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ihacku 2014-12-06 18:09:22 +08:00
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aaaa007cn 2014-12-06 18:10:57 +08:00
pngquant 了一下那张 example-orig.png
默认参数的结果是 15.5 KB 然后去官网瞄了下 http://pngquant.org/ >> TinyPNG and Kraken.io — on-line interfaces for pngquant 唉？TinyPNG 就是用的 pngquant？ |
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GPU 2014-12-06 18:21:40 +08:00
意思是可以抛弃 jpg ？
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rainex 2014-12-06 18:43:22 +08:00
How does it work?
Excellent question! When you upload a PNG (Portable Network Graphics) file, similar colors in your image are combined. This technique is called “quantization”. Because the number of colors is reduced, 24-bit PNG files can be converted to much smaller 8-bit indexed color images. All unnecessary metadata is stripped too. The result: tiny PNG files with 100% support for transparency. Have your cake and eat it too! --------- 是说减少颜色数吧？一般ps或firework输出时有点经验的人都会选择合适的颜色数来减少尺寸的，tinypng比这样处理过的文件还小是么？ |
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aaaa007cn 2014-12-06 21:11:01 +08:00
@emric
用的什么参数？即使 --quality 10 结果都有 10KB+ 啊 @snail1988 https://news.ycombinator.com/item?id=4168451 pngquant + optipng + advpng TinyPNG 还有 40 美刀的 PS 插件出售…… pngquant 本身是 BSD 许可的，也有同样 BSD 许可的免费的 PS 插件 SuperPNG 该说 BSD 许可真好用？Note that both licenses are basically BSD-like; that is, use the code however you like, **as long as you acknowledge its origins**. 虽然我没在 TinyPNG 网站上看到有提到 pngquant pngquant 官网有写 To further reduce file size use optipng or ImageOptim. 不过 Mozilla 没做 pngquant 和 optipng 合用的测试 https://wiki.mozilla.org/Mobile/Janus#PNG_Compression 不知道还能有多少效果 @rainex https://news.ycombinator.com/item?id=4168796 关键的还是如何进行矢量量化？ http://pngquant.org/#algorithm 和 PS save for web 的对比 http://pngquant.org/vsphotoshop.html @GPU 话说 HN 那串 https://news.ycombinator.com/item?id=4167964 有张构造得很巧妙的图  我这里唯一能不显著劣化并减少文件尺寸的方法就是另存为 jpg |
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efi 2014-12-07 09:57:04 +08:00
tinypng可能把图中的关键颜色给优化掉。有时需要pngquant手调参数。
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